35kV集合式电容器保护动作原因分析及整改措施

随着集合式电容器的大量使用,集合式电容器故障也逐渐增多。本文针对一起集合式电容器差压保护误动案例,通过一次设备检查、定值计算和差压计算等3个方面进行详细的分析,发现该类型集合式电容器存在差压保护灵敏度不足问题。最后通过采取对电容器保护方式改造、提高保护定值裕度、降低保护误动等措施降低集合式电容器因差压保护灵敏度不足问题而引起的故障。

Analysis of Protective Action Cause and Improvement Measures for 35 kV Assembled Capacitor

With the extensive use of the assembled capacitors,the fault of them increases gradually.In view of protective action example of the capacitor,it is found that insufficient differential protection sensitivity is existed in the capacitor throughout detailed analysis from such three aspects as inspection of primary equipment,setting calculation and differential voltage calculation.Finally,such measures as modifying protectionmode,improving the protection setting margin and reducing protection mal-operation are taken so to reduce the fault of the capacitor due to insufficient differential voltage protection sensitivity.